Adding services to autopopulate and clear autopopulated allowlist entries

What does this MR do and why?

Following on the changes in Ci::JobToken::AuthorizationsCompactor (!172152 - merged) and as detailed in #478540 (comment 2241812875), this MR adds two services:

1. Auto-populates the allowlist entries for a given project from the Authorizations log
2. Deletes all auto-populated entries for a given project

Database Review

Ci::JobToken::GroupScopeLink.create! is used in the context of creating new entries, and produces this query and plan:

INSERT INTO
  "ci_job_token_group_scope_links" (
    "source_project_id",
    "target_group_id",
    "created_at",
    "autopopulated"
  )
VALUES
  (37, 22, '2024-12-12 16:42:35.346468', TRUE) RETURNING "id"

Insert on ci_job_token_group_scope_links  (cost=0.00..0.01 rows=1 width=74)  
  ->  Result  (cost=0.00..0.01 rows=1 width=74)

Ci::JobToken::ProjectScopeLink.create! is used in the context of creating new entries, and produces this query and plan:

INSERT INTO
  "ci_job_token_project_scope_links" (
    "source_project_id",
    "target_project_id",
    "created_at",
    "direction",
    "autopopulated"
  )
VALUES
  (1, 37, '2024-12-12 16:44:22.594892', 1, TRUE) RETURNING "id"

Insert on ci_job_token_project_scope_links  (cost=0.00..0.01 rows=1 width=76)  
  ->  Result  (cost=0.00..0.01 rows=1 width=76) 

Ci::JobToken::GroupScopeLink.autopopulated is used in the context of deletion, and produces this query and plan:

DELETE FROM
  "ci_job_token_group_scope_links"
WHERE
  "ci_job_token_group_scope_links"."autopopulated" = TRUE
  AND "ci_job_token_group_scope_links"."source_project_id" = 999

Delete on ci_job_token_group_scope_links  (cost=0.00..0.00 rows=0 width=0)  
  ->  Seq Scan on ci_job_token_group_scope_links  (cost=0.00..0.00 rows=1 width=6)  
        Filter: (autopopulated AND (source_project_id = 999))  

Ci::JobToken::ProjectScopeLink.autopopulated is used in the context of deletion, and produces this query and plan:

DELETE FROM
  "ci_job_token_project_scope_links"
WHERE
  "ci_job_token_project_scope_links"."autopopulated" = TRUE
  AND "ci_job_token_project_scope_links"."source_project_id" = 999

Delete on ci_job_token_project_scope_links  (cost=0.00..0.00 rows=0 width=0)  
  ->  Seq Scan on ci_job_token_project_scope_links  (cost=0.00..0.00 rows=1 width=6)  
        Filter: (autopopulated AND (source_project_id = 999))  

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